A
- Aberrant Spirit aberration, CR —
- Aboleth aberration, CR 10
- Ancient Chaos Beasts aberration, CR 11 (7,200 XP)
- Annulid Broodling aberration, CR 1/2 (100 XP)
- Annulid Gargantuan aberration, CR * The annulid can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
- Annulid Hierophant aberration, CR * The annulid can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
- Annulid Messiah aberration, CR 18 (20,000 XP)
B
- Beholder aberration, CR 13
- Berbalang aberration, CR 2
- Black Slaad aberration, CR 29
- Blue Slaad aberration, CR 7
- Brown Slaad aberration, CR 10
C
- Cadaverous Annulid aberration, CR 9 (5,000 XP)
- Chaos Beast aberration, CR 6 (1,800 XP)
- Charm Devourer aberration, CR 2
- Choker aberration, CR 1
- Chuul aberration, CR 4
- Cloaker aberration, CR 8
- Cranium Rat aberration, CR 0
- Cyan Slaad aberration, CR 10
D
- Death Kiss aberration, CR 10
- Death Slaad aberration, CR 10
- Derro aberration, CR 1/4
- Derro Savant aberration, CR 3
E
- Elder Brain aberration, CR 14
- Eldritch Hag aberration, CR 9
F
- Flumph aberration, CR 1/8
G
- Gauth aberration, CR 6
- Gazer aberration, CR 1/2
- Gibbering Mouther aberration, CR 2
- Gray Slaad aberration, CR 9
- Green Slaad aberration, CR 8
- Grell aberration, CR 3
I
- Indigo Slaad aberration, CR 10
- Intellect Devourer aberration, CR 2
M
- Mind Flayer aberration, CR 7
- Mind Flayer Arcanist aberration, CR 8
- Mind Flayer Infiltrator aberration, CR 10
- Mindwitness aberration, CR 5
- Morkoth aberration, CR 11
N
- Neogi aberration, CR 3
- Neogi Hatchling aberration, CR 1/8
- Neogi Master aberration, CR 4
- Neothelid aberration, CR 13
- Nothic aberration, CR 2
O
- Orange Slaad aberration, CR 10
- Otyugh aberration, CR 5
R
- Red Slaad aberration, CR 5
S
- Slaad Tadpole aberration, CR 1/8
- Spectator aberration, CR 3
- Star Spawn Grue aberration, CR 1/4
- Star Spawn Hulk aberration, CR 10
- Star Spawn Larva Mage aberration, CR 16
- Star Spawn Mangler aberration, CR 5
- Star Spawn Seer aberration, CR 13
U
- Ulitharid aberration, CR 9
W
- White Slaad aberration, CR 21
- Will Devourer aberration, CR 2